scripted-diff: Rename rpc_timewait to rpc_timeout

-BEGIN VERIFY SCRIPT-
sed -i -e 's/self.rpc_timewait/self.rpc_timeout/g' $(git grep -l self.rpc_timewait)
-END VERIFY SCRIPT-

test/functional/feature_pruning.py

@@ -29,7 +29,7 @@ class PruneTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 6
-        self.rpc_timewait = 900
+        self.rpc_timeout = 900
 
         # Create nodes 0 and 1 to mine.
         # Create node 2 to test pruning.